Re: PTO types

Posted by Rod F. on August 23, 2005 at 19:25:29 from (142.177.6.5):

In Reply to: PTO types posted by Jim in NH on August 23, 2005 at 17:01:34:

Non live or transmission PTO is just that... the PTO is driven off the transmission.
Live PTO uses a 2 stage clutch, and is free of the transmission. However, it's not free of the clutch. The first stage stops the tractor, second stage stops the PTO. Live PTO can not be shifted on the go. Tractor will be stopped, or at least not under power.
Independant PTO is just that. Completly, fully indepandant and separate from the transmission and clutch. Most systems use a drive hub on the rear side of the pressure plate which drives a shaft completly through the transmission, and has a clutch behind the transmission to control the PTO. This system can be shifted any time on the fly.
Ford, and most others used a hydraulically actuated, multiplate wet clutch to drive the PTO. It works on much the same principle as the clutches in your car's automatic transmission. Some, like Fiat used a dry plate clutch for the indepandant PTO, but most Ind. PTO's were wet. Wet clutches are generally considered to be more durable and longer lasting, combined with being more compact relative to their power transfer ability. Dry clutches are cheaper to make and repair, but generally won't have the service life.
The bottom line is that if it requires using the clutch, it's not indepandant. Indepandant is, by far, the most desirable PTO to have. Followed by LIVE. I just wouldn't have a non live PTO on a tractor. Confused or what?

Rod

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